Slick Trick Slick Trick does it again! The Viper Trick is a super penetrating COC traditional head as strong as 1 piece heads, but with replacable blades that are sharper and also resharpen sharper. Viper Trick with its LUTZ Solingen Germany custom knife grade Mercedes blades sharpened at the 20 degree angle knife makers use for the greatest sharpness. The Viper Trick has exceptional strength and penetration, wicked sharpness for better blood trails, the straight as a laser flight you expect from Slick Trick, and the famous ST 4 blade "SLUG HOLES". Viper Trick features .035" SS Lutz blades with a 1.94" total cutting surface 4 blade. 125 grain 3 pack.